Accumulator

US20090064674A1Inactive Publication Date: 2009-03-12BORGWARNER TORQ TRANSFER SYSTEMS AB
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
BORGWARNER TORQ TRANSFER SYSTEMS AB
Publication Date
2009-03-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

An accumulator for a hydraulic system, wherein the accumulator comprises a liner, a piston and a housing, that defines a pressure chamber, for receiving hydraulic fluid at high pressure, wherein the piston is biased towards an end position of the pressure chamber for interacting with the hydraulic fluid in the pressure chamber, and the piston is movable in a predetermined range for accumulating hydraulic fluid. The accumulator has at least one outlet port in a sidewall of the liner, which outlet port is covered by the piston in the predetermined range and is uncovered when the piston has moved a predetermined distance from the end position. A hydraulic system is also provided that comprises the above accumulator and an all-wheel drive system comprising the above hydraulic system. A method for de-airing an accumulator according to above is also provided.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application is a continuation of pending International patent application PCT / EP2007 / 050565 filed on Jan. 19, 2007 which designates the United States and claims priority from Swedish patent application 0600524-3 filed on Mar. 10, 2006, the content of which is incorporated herein by reference.FIELD OF THE INVENTION

[0002] The present invention relates to an accumulator for a hydraulic system and a method of de-airing a hydraulic system comprising such an accumulator. It furthermore relates to a hydraulic system and an all-wheel drive system incorporating said hydraulic system.BACKGROUND OF THE INVENTION

[0003] Hydraulic systems are normally equipped with a pump that provides high-pressure oil to actuators and control valves. An accumulator can be connected to the high-pressure side where it inter alia can serve to remove pressure fluctuations in the hydraulic system. The pressure at the high-pressure side should be limited, though,...

Claims

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